Slip bushing



March 15, 1932. vERGooD SL I'P BUSHING 2 Sheets-Sheet 1 Filed July 14,1928 March 15, 1932. G. R. LIVERGOOD SLIP BUSHING Filed July 14, 1928 2Sheets-Sheet 2 Patented Mar. 15, 1932 v U TED- eERaLn n. LIvEneoon, ornousron, 'rnxlis smr nusnme Application filed Jul '14,

My invention relates to bushings for use with slips in handling pipeinwells.

In. well drilling and puniping'ioperations I I l the plane 4%tfiof Fig.l.

' when pipev is being inserted into or removec .5, from the well itisnecessary to hold the weight of the pipe by slips fitting within a"bushing, supported within the 'rotarystable,

, or within a special type of casing head. The slips are tapered jawsadapted to seat 'inthe I0 bushing or adapter; and'wedge between the sameand the pipe, and sustain the Weight of the pipeinthe well. I I Theadapter bushing is ordinarily a down; wardly tapered tubular bowlwhichjwedges 15 the'slips towards the pipeand, as the bowl is rigid, theslips sometimes arewedged'therein so tightly by the immense weight whichthey have to support that it is diflicult to withdraw 3 the slips. Amaul or hammer has to' 'be employ-ed to jar the slips loose from thebush-y %t is an object ofmy invention tofp'rovide a bushing which willreleasethe slips employed therewith 25 ficulty. e d p It is desiredthatjthe' bushing be flexible in construction so that it will notloc-lrwith the slip jaws,,b,ut will release a's soon as the gqpipe iselevated. v 3 A further object is toproduoe a bushing which may beadjusted to vary the working: diameter thereof and which mayberezidily,

handledin use. 7 g

.It is desired that the bushing beconstruct parts of thebushing are heldtogether is designed to be seated within an opening in the;

rotary table, preferably in such manner that;

the bu'shi .table. Referring to thedrawingsherewith, Fig."

' "Fig. 3is'a broken ean o thfholcling place therein.

' lower ring? quickly and without dif;

' bowl into eight longitudinal sections;

this provision I am enabled to allow a cered to fit within a rotarytable or'spider and; the holding meansby meansofwhich the,

ng will not rotate relative to the} l is a top plan' view of thebushing, partsbecuring the partsof the bushing'together;

1923. Serial No. 292,843.

plate employed with-the bushing taken on the plate 3-3 of Fig.1. 1 1. V

Fig. 4 is a broken sectional detail taken Fig;f 5 ,,1s a verticalsection through'lny bushing showingthe pipe engaging slips 1n Fig. 6 isa fragmental view], partly in vertical section, showing one formofeng'age} ment between the plate and the bushing.

" Fig.7 is a horizontal section showing the Fig. 8 is a plan viewofaholdingplateto. fitia circular opening. Y l i i Fig.9 is a fragmentalplate shownin Fig. 8.

. In constructing my forming the same of the general shape now edgeviewv of the 5 commonly employed; that is, it is a tubular I bowltapered from itsupperend downwardly to'fit' within the tapered seat 1within a} robushing I contemplate: i V

tary table. It is tapered on its innerside V at 2to receive the jaws3of'slips which are] toothed on their inner faces "at lto engage thepipe 5. The tapered bowl is divided longitudinally into a plurality ofparts and as will be seen from Fig; '1 I have divided the tainflexibility between the sections of thebushing which will allow it.torelease from V the seat 1 while in operation. I

The sections 6 into whi h inner face 2 of each section is tapered atfathe bowl s divided-are formed with radialsides and the comparativelyacute angle relative to the 7.

central axis of the'bushing so" that the jaws of the slips may obtainatight wedging effect between the pipe and the'bushing and moreeffectively grip the pipe. Theouter faces of the f sections somewhatbelow the longithe plate'to al-low 'the insertiO'Iithere-throughyo'f-pins' or dowels 9. The openingsarelelonev gated horizontally so asto allow a; slight lateral movement of the j aw sectionsfrelativefl I totheholding plate.- Thescrewsordowels 9 are secured within the innersides of grooves 10 in the outer faces of the sections. As will be seenfrom Figs. 2, 5 and 6, the plates 7 are of greater width on the innersides than on the outer sides, thereby providing a dovetail effect,preventing the outward movement of the plates in the grooves. The platesfit loosely in the grooves so as to allow relative movement of thesections of the bushing, as will be apparent. The two plates 7 form acircle divided diametrically and act to secure the bushing sectionstogether as two units adapted to be inserted within the seat in thetable and which, when fitted together, entirely surround the openingthrough the table.

Adjacent the upper end of the bushing is a holding plate for thesections. In the Fig. l embodiment this plate 14 is rectangular inshape-to fit within a recess 15 in the rotary table Said plate isdivided diagonally into two sections and these sections maybe securedtogether by tongues 18 at the corners along the meeting line 21. Saidtongues are formed one upon one half of the plate and the other upon theother hah and each projects into a slot 20 in the mating half. When thusfitted together and set withinthe recess in the table the parts will beheld together during operation.

The plate 14 is formed with a central opening of suitable size toreceive the bushing. The said opening is circular and is provided with acutaway portion on its innerupper side to provide a seat 22 forthebushing sections 6, The said bushing is cut with an annular groove 15into which said plate projects, the upper flange 24 thus provided uponthe sections resting upon the seat 22. The groove is materially widerthan the thickness of the plate below the flange 24 so that there isfree vertical play'of the sections of the bushing relative to the plate.The sections of the bushing are separately secured to the plate by pins25 extended through the flanges 24 of the bushing sections, and throughopenings 26in the plate, and into the body of the sections below thegroove. Thehead of each pin is threaded to screw into the bushingsection above the groove, as seen in Fig. 2. The openings 26 arematerially larger-than the pins sothat the sec-s tions are freelymovableon the plate. The. handles 27 are connected with the plate 14.

The efiective size of the bushing :maybe regulated by controlling theheight of t-he supporting plate 14 inthe seat .15 in the rotary table.By the use of .theadjustable screws 19 at each corner ofthe platel am.

enabled to raise or lower the bushing in its seat as wlll be understoodfrom Fig. 4.

The plate may be made to engage the bushing as shown in Fig. 6. ifdesired In'this embodiment the seat 22 is'slopedrdownwardly away fromthe bushing and the lower face "when desired.

.Sometimes the rotary seat is circular in shape, and in such case theplate 14 must be replaced by a circular plate 14 shown in Figs. 8 and 9.Each of the sections of the plate may havea tongue 3O fitting within agroove'31 in the other section. Openings 32 for the pins 25 are providedas'before.

In usethe bushing will seat within the rotary opening 1 with the upperflange 24 of thebushing resting upon the plate as seen in Fig. 2.Theheight of the plate in the re cess 1'5 of the rotary seat isregulated by the pins 19 so that the effective diameter ofthe bushingmaybe changed toprovide for wear orfor variation in the sizes of rotaryopenings. Thus the .pipe engaging slips will always be provided with .aseat of a size to receive them. Furthermore, when the plate is thus heldabove the lower side of the recess 15in the rotary seat, when thebushing is raised, each individual section can move freely to obtainrelease from the wedging action of the slips.

In'handling my invention the sections of thebu'shing may be heldtogether in two units by means of the divided'plates 14 and 14, asdescribed and may therefore be fitted within the ,seatl'in therotary'table orin the casing head without difficulty. The outer taperot' the bushing is a more obtuse taper than is the inner taper :of thebushing and will be adapted to fit within ,andlrelease easily from therotary table. .The separate sections of the bushing are joined soflexibly together that the bushing may be fitted within the ordinaryrotary table with little difliculty and thisflexible construction alsoallows the ready release of the bushing from the table so that no hammeror maul willbe necessaryat any time. This'wi'lllbe mucheasierinhandling, it'avoi'ds the wear and tear upon the rotary and thebushing and allows the bushing to release without injury thereto or tothe table.

It also permits the slipj'aws 3 to drop away i from "the pipe-and toavoid the .ditliculties usually encountered where the bushing is a solidandrigid part. I

, This-device is flexible in use and it will be 7 seen that when thejaws have been placed thereinas shown in Fig. 1 to grip the pipe. therelease of the jaws from the pipe may be obtained by moving the pipe 5upwardly. If

the jaws 3 are tightly wedged between the" bushing and the pipe so thatthey will not readily release, the bushing will be elevated,

with the pipe a sufiicient distance to .allow the sectionsof the bushingto spread away from the aws and thus allow them without furtherdifiiculty.

The further advantages of the device will be apparent to those skilledin the art. What I claim as new'is: r

1. A slip supporting bushing for rotaries including a downwardly taperedbowl having a peripheral recess adjacent the upper end,

said recess having its upper shoulder inclined downwardly and outwardly,a plate adapted] to fit within said recess and engage said shoulder,means to support said plate, said plate being divided transversely intotwo parts, said bushing belng longltudlnally dlvided' into a pluralityof sections upon'each part of said plate.

2. A slip supporting 3. A slip-supporting bushing adapted to fit I atapered seat in combination with a rotary table having a seat, saidbushing being longitudinally divided into sections, a plate holding saidbushing sections together loosely, a

shoulder on said seat,'and adjusting screws on said plate engaging saidshoulder and adapted to vary the vertical position of said bushing insaid seat, for the purpose described. v V

4. A slipsupporting bushing adapted to fit l a tapered seat. saidbushing being longitudinally divided into sections, means holding saidbushing sections loosely together, and

adjusting means on said holding means'cooperating with said seatto varythe working diameter of said bushing.

5. A downwardly tapered supporting bushing adapted to fit a taperedtable seat,

said bushing being divided longitudinally, and means to adjustsaid'bushing within a certain range of positions whereby the workingdiameter of said bushingmay be varied between a plurality of fixedpositions. 7

6. A slip supporting bushing tapered on its outer face to fit a seat ina rotary table, and

' Q tapered on its inner side to receive pipeento release j v downwardlytapered bowl, shaped to fit a stabushing for rotaries' including adownwardly tapered bowl having a peripheral recess adjacent the upperend, said recess having its upper shoulder inclined 7. A longitudinallydivided slip supporting bushing adapted to fit a downwardly taperedrotary'seat, and'means to make a positive adjustment of said bushinvertically in said'seat andthus vary its wor ing diameter.

8, An adapter bushing including a tubular tionary support said bowlbeing divided longitudinally into a plurality of arcuate parts, eachpartbeing composed of a plurality of said l sections convergingdownwardly and means tohold said sections loosely in spaced relation,said means including a plate divided transversely into two sections.

9. An' adapter bushing including a tubular separate sections, the outerand inner walls of downwardly tapere'd'bowl, said bowl being dividedlongitudinally into a plurality of arcuate parts, each part beingcomposed of a plurality of separate sections, the outer and inner wallsof said sections-converging downwardly and means to hold said sectionsloosely in spaced relation, said means including a polygonal plateshapedto fit within a rotary table and divided diagonally into twohalves,

each half flexibly supporting a'plurality of sections.

10. A longtiudinally divided adapter bushing, a rotary seat to receivesaid bushing, said seat having a countersunk recess at'its upper end, aholding plate, in said recess, said plate being divided into halves, aplurality of bushingv sections. on each half, means to adjust said platevertically in said recess, and means "on said plate engaging saidbushing sections to allow said sections to move outwardly a said plateis raised.

11. A longitudinally. divided adapter bushing, a rotary seat toreceivesaid bushing, said seat having a countersunk recess at its upper end, aholding'plate in said recess, a plurality.

of'bushing sections on said plate, meansto adjust said plate verticallyin said recess, and

means on said-plate engaging said bushing sections whereby said sectionsmay move outwardly as said plate is raised.

In testimony whereof I hereunto affix my signature this 10th day of JulyA. D. 1928. GERALD R. LIVERGOOD."

gaging slips, said bushing being formed in a:- 3 v plurality of parts,and means to adjust said.

bushing whereby its, working diameter may 7 i be varied betweenaplurality of fixed positions.

